Toshiba nv Series - C.4 AC Output Modules

C.4 AC Output Modules
Unified Controller nv series type2 light Controller Unit Instruction Manual
121
C.4 A
C Output Modules
(1) The AC output module (AC963) contains a 2A fuse per common terminal.
Even if a load short circuit occurs, the triac is protected by fuse blowout. Note that
when the fuse blows, the triac is also damaged to no small extent. Pay sufficient
attention to make sure that that none of load short circuits or the like will occur.
(2) If the inductive load is connected to the module, a transient voltage with a
relatively large energy is generated at OFF time. To prevent a malfunction that
may be caused by this surge voltage, the AC output module is equipped with the
CR snubber circuit. If the external wiring is used for routing, this surge voltage may,
however, have an adverse affect on other signal system. Thus, be sure to install
the surge absorbing element in parallel to the inductive load. (Locate the element
in the closest possible position to the inductive load.)

Surge absorbing element Varistor, TNR, or Transil (for voltage clamp) 
Bidirectional overvoltage absorbing element
the rated voltage of which is 1.2 times more
than the maximum, or peak, voltage 
 
Snubber (CR) circuit (for high frequency attenuation) 
〜

AC output modules

L

Surge absorbing element

Figure C-14 Connection of inductive load
(3) The AC output module does not have the zero cross function. OFF-to-ON change
occurs regardless of the phase of the load voltage.
However, at ON-to-OFF change time, the load current changes near zero. For the
load response, also take this into consideration.
DC resistance of load
(I: Load current peak value
in stationary state)